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Generally, atomic radii have this property on the periodic table: as you go down or left, the radius of an atom gets larger. 

With this logic, let's apply this to the problem above. Li is on the highest part of the table compared to the other elements. Below it is Na, then K, then Rb. From our rule, we know that as we go down on the table, the atomic radius gets larger. 

Thus, Li has the smallest radius, and Rb has the largest radius.

FINAL ANSWER: Li, Na, K, Rb

The atomic radius of the chemical element is defined as the measure of the size of atoms. It is the distance from the center of the nucleus to the boundary of shells to the nearby surrounding shells of electrons.

The increasing order of the elements are:

Li < Na < K < Rb

The atomic radius of the elements in the periodic table follows a certain trend. The radius decreases across a period and increases down the group.

In the given elements, Lithium is present above the sodium will have a smaller atomic radius than the sodium. It is then followed by the potassium that has greater size and therefore, the size of the atomic radius will be more than the other elements.

Thus, the correct trend of the elements are Li < Na < K < Rb.

To know more about atomic radius, refer to the following link:

https://brainly.com/question/238050

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